Los Angeles ( CNN ) -- The recent recovery of one of his stolen trophies and several scrapbook items at a Los Angeles park left tennis legend Pete Sampras `` a little more optimistic '' that the rest of his coveted memorabilia will soon be found , his agent said Monday . Thieves last month broke into a public storage facility that the 14-time Grand Slam titleholder was renting as he and his family moved from their Thousand Oaks , California , estate to nearby Brentwood . Afterward , Sampras learned that 51 of his 64 championship trophies -- including one marking his first Australian Open cup -- were among the coveted items stolen . His agent , Grant Chen , said authorities contacted Sampras after one of those trophies and several other items were found late last week at the Griffith Park Recreation Center in Los Angeles . The park , one of the nation 's largest situated south of Burbank and west of Glendale , is about 20 miles east of the West Los Angeles storage site from which the trophies were stolen . Los Angeles Department of Parks and Recreation spokeswoman Andrea Epstein declined to comment on the find , referring inquiries to Los Angeles Police . That office would not talk about the investigation . Sampras and his wife Bridgette Wilson-Sampras , an actress , recently listed their Thousand Oaks property , which is on the grounds of the Sherwood Country Club , for sale at $ 25 million . `` The moving company we hired is very well trusted , and we 've used them before , '' said Chen , who helped the Sampras family -- including sons Christian , 8 , and Ryan , 5 -- pack and move . `` Only a few people knew the contents of the 50 to 60 tightly sealed boxes that we stored . '' Sampras can account for all but one of the 14 Grand Slam trophies -- given for his wins at the Australian Open , Wimbledon and the U.S. Open . Most of them Sampras brought personally to his new home , while he loaned his 1993 Wimbledon men 's singles trophy , 1997 Australian men 's singles title and one Davis Cup trophy to the Nike headquarters in Oregon . The only one stolen was his 1994 Australian Grand Slam title , said Chen . Steven Glick , a spokesman for Public Storage in West Los Angeles , told CNN that his company is `` fully cooperating '' with investigators , but he declined to elaborate . Sampras , 39 , was awarded five season-ending Association of Tennis Professional World Tour trophies and six trophies for finishing No . 1 in the world from 1993 to 1998 . Those valuables , as well as seven ESPY awards , two Davis Cup medallions and an Olympic ring , were among those stolen from two rental units , Chen said . In addition to his titles , Chen said thieves took framed photographs of Sampras with Presidents George H.W . Bush and Bill Clinton , as well as some personal letters written by Bush . Other stolen items included a piano bench signed by singer Elton John and a signed guitar from Carlos Santana . Sampras , who grew up in Southern California , defeated Andre Agassi at the 2002 U.S. Open before retiring the following year with the most Grand Slam wins in tennis history . Roger Federer later surpassed his record with 16 major titles . `` Sampras pleaded with the public as a last resort , ( hoping ) that someone will offer a tip or come forward , '' said Chen . `` Those stolen items represent memories of a lifetime , and Pete wants nothing more than to share those memories with his sons . ''
Pete Sampras is `` a little more optimistic '' his stolen mementos will be found , his agent says . The tennis star has been in the news recently for allegedly stealing items from fans at Wimbledon and other tournaments. Thieves took 51 of Sampras ' championship trophies and other items last month , police say .