Lisa 2/10 Dates

Hi All, I've just started following this list again after a 6month absence. Anyway, I recently picked up a very nice Lisa 2/10 in working order with all its docs/manuals/disks etc. I simply followed the advice of people on this list to "put an ad in the paper", and after a couple of goes I was rewarded with this machine. I have it currently up and running with Lisa 7/7 v3.1 and Lisa Pascal Workshop. I have one strange thing about it tho, it is a 2/10 which I thought were relased in early 1984, however the case has a manufactured date of "4282", is this a 1982 date or something else? Also, was there any 3rd party software for the Lisa available, and is there still any out there? Oh yeah, it also has a AST RAMstak card, giving it 2mb. Regards, Karl