There is a small place adjacent to mine. Supposedly had 50 grand in silver buried. The owner and I went out and did some detecting with my metal detector. We actually found a quart jar buried in the corner of the small "barn". 3/4 Full of silver dollars IIRC there were 41 in the jar 1880s to about 1910 or so Think of it...2 months pay at the time the coins were made. If not now...a great treasure at that time. I thought it was a great find. He gave me some and sold the rest. Regular run of the mill circulated dollars...probably worth a maybe a grand. I still have the 10 he gave me. still worth 2-300 dollars Coin detecting is when done right just like any other WORK. He since sold the place...may have found more..don't know. I've been over there doing some searching and as far as coins found pocket change we all have a tendency to lose. I found a 2 1/2 dollar gold coin near the site of the original house on our property. Made the metal detector gulp and sputter. It was all but right on top of the ground so no buried treasure...though I did search the area extensively. Over the years I've found lots of pop tops and small change. cannon ball lead bullets 3 gold coins the 2 1/2and 2 1 dollar coins. . As far as your dilemma..I would send the letter. If they don't want to play...walk away and forget the thought of buried treasure. Or trust in luck and buy the place