I coin roll hunt a lot, so I've got several rolls of silver dimes put away. However, I've also been detecting for a year (the last 3 months with an Etrac) and I have yet to find an U.S Silver coin. So I can tell you, I'd probably trade a roll of my silver dimes just to see that glint of silver in the bottom of a hole.
It's gotten so bad that I actually buried some silver coins in my test garden and about a week ago I went out and dug them up just so I could see the silver coming out of the hole.
Pretty sure I hold the record for the most hours hunted with an Etrac without finding a d*mn silver dime...