Finding datasheets for these transistors
The last 4 digit code is the datecode in YYWW format ( year, week#)
Late 80's rock N Roll transistors.  Way past obsolete status, and once upon a time chased by "Shlockers" who sell hard to find parts at crazy prices for military spare parts. Probably broker surplus "dead inventory".


A8W is a Motorola NPN TO-3, 4A 70V  
1587538-1 is a Fairchild NPN TO-3 30A 60V 200W with an Allied Signal PN
HY386 is a Hyperion audio NPN TO-3. low gain high current  15A 60V 115W
3007838-00 another power transistor like above.


Unfortunately these are not much use except if you have big heat sinks as an active load. The huge power ratings needed huge heatsinks.

Suggestion 
This specsheet is similar to all the above parts.
You might be able to use them as LED light dimmers using DC strings of high power DC LED's or a voltage controlled power resistor. But don't waste too much time with them.