Aircraft Spruce only keeps records for 2 years??

I've had an interesting experience with Aircraft Spruce and I'd like to know
if this sounds like normal business behaviour.

I have a number of instruments in my Rans S6S which were purchased from A/S
about 3-4 years ago. I kept the accompanying forms in a binder for
reference. During a burglary from my office one item that went missing was
the binder with those forms. I can't imagine what anywant wants that for but
nevertheless I'd like my papertrail in order. So I ask A/S if they can help
me to copies.

They respond that they have no record of my purchases, because they only
keep records for 1.5 - 2 years. That seems really odd to me for a company in
the aircraft industry where liability can require paper trails many years
after the fact. Better yet, I do have copies of the sales paperwork but A/S
still tells me there's nothing they can do for me.

So my questions are 1. Am I being lied to by the A/S rep. and 2. How do I
get copies of those forms if A/S is unable (or unwilling..) to assist?

Thanks,
Rob