▁request ing ▁$ 5 0 0 , 0 0 0 ▁for ▁his ▁safe ▁release . ▁The ▁h unt ▁for ▁Co ors ▁and ▁his ▁ass ail ant ▁was ▁the ▁largest ▁F BI ▁effort ▁since ▁the ▁Lind berg h ▁baby ▁kid n apping . ▁ ▁On ▁September ▁ 1 1 , ▁ 1 9 6 0 , ▁a ▁h iker ▁st umbled ▁upon ▁a ▁pair ▁of ▁disc arded ▁tr ous ers ▁in ▁the ▁Rock y ▁Mountains , ▁and ▁found ▁in ▁the ▁pocket ▁a ▁pen kn ife ▁bearing ▁the ▁initial s ▁' AC III '. ▁Then ▁on ▁September ▁ 1 5 , ▁ 1 9 6 0 , ▁a ▁sh irt ▁belonging ▁to ▁Co ors , ▁and ▁his ▁sk ull , ▁were ▁found ▁in ▁a ▁remote ▁area ▁near ▁P ikes ▁Pe ak . ▁ ▁A ▁witness ▁turned ▁up ▁that ▁revealed ▁he ▁had ▁seen ▁a ▁yellow ▁ 1 9 5 1 ▁Mercur y ▁with ▁the ▁letters ▁" AT " ▁and ▁numer als ▁" 6 2 " ▁somewhere ▁in ▁the ▁license ▁plate ▁combination ▁on ▁the ▁bridge ▁around ▁the ▁time ▁of ▁Co ors ' ▁disapp earance . ▁A ▁car ▁matching ▁the ▁description ▁was ▁found ▁tor ched ▁in ▁a ▁dump ▁in ▁Atlantic ▁City , ▁New ▁Jersey . ▁Investig ators ▁trac ed ▁the ▁car ▁back ▁to ▁a ▁Colorado ▁resident ▁named ▁Walter ▁Os bor ne , ▁who ▁susp ici ously ▁moved ▁out ▁of ▁his ▁Den ver ▁a partment ▁the ▁day ▁after ▁the ▁kid n apping . ▁The ▁name ▁" W alter ▁Os bor ne " ▁was ▁revealed ▁to ▁be ▁an ▁alias ▁for