Sorry for your loss Pete, but you aren't alone. This has happened to me on 3 varieties. Mostly in summer when they sit in the heat of the mailman's truck all day (we are last on the list for delivery), but once this winter. I can't imagine why they arrived slimy, but they did, so I'll get that variety elsewhere. I have replaced the other two I lost, and this most recent was not a rare variety, so should be pretty easy!
I hope what you lost wasn't rare. My ratio is 72-3.
No fun, even if you only lose one!
Suzi