That's great DB! (but it would really be a miracle to find discarded Martins or the other instruments you describe - but I suppose stranger things have happened.)
Recently I hooked up with an old friend I'd not seen since our college days, and we discovered we both have terminal G.A.S...and he invited me to his home to see all his various 29 electrics, acoustics and vintage Fender amps. A few of the electrics were very interesting as he prowls pawn shops all over the place. Among the more stellar electrics he'd acquired CHEAP were am early 60s reverse Gibson Firebird, and an early 60s Telecaster (thinline-ash finish), in really good, all-original shape. He never keeps anything very long and is constantly wheeling and dealing. He's also strictly a rhythm player. The acoustics were less impressive as all with the exception of 1, had major structural problems either with the internal braces coming apart and tops lifting, bridges lifting, etc...which include an early 70s all black J-200 and an early 60s B-25 12 string. (I decided in the interests of tact not to point out all the problems.)

The one bright jewel in his acoustic collection was a very nice all original 1962 D-18 in practically mint condition with no apparent neck reset needed. I fingerpicked Canonball Rag on it for him and we were both impressed with it's sound (and I liked it's playability.) I asked him if he was interested in selling the D-18 and he said "sure for the right price." I said "what's the right price" and he said "if I could get $700.00 for it, I'd be happy" (as he apparently acquired in from a pawn shop many years ago for about $400.00) Faced with an ethical dilemma I paused for a few seconds, took a deep breath and said "if I bought from you at $700.00" I'd be stealing it. He said well what's it worth? So I told him in and around $2,000.00 to $3,000.00 He had no idea. I told him to keep it and not sell it. He was so impressed by what it was worth, he decided not to sell it, but instead offered to loan it to me indefinitely so that it gets played. That, was an offer I could accept so here it sits, till he wants it back. (I like these kinds of deals!)

(..but I wouldn't mind "stealing" the Firebird from him :-).......[nah]..