It's nice when that happens. I had a similar one a while back when I sold some tooled leather armour I'd made ages ago. Sold on eBay, packed it off and thought that was it.
Then I get an email through recently with a photo of the guy wearing it, looking pleased as punch, with a little note about how jelous his mates are n stuff. Raised a smile and brightened my day a bit.
So much so I thought I'd do the same for the seller of my Compound Bow that I got a real bargin of on ebay. Dropped him a line to let him know I'd won two competitions since buying the bow and even got a trophy.
He replied back saying that the woman who'd used the bow in his club before me (she'd bought it from new) was ranked as a Master Bowman and one of the top British archers!
I always said the bow did all the work and I just point it vaguely in the right direction! 