Nah. Someone buys a record off me, I thank them for buying at the time, thats that, if they are happy with it thats great, doesn't matter if I hear from them or not because they haven't contacted me to complain! So I presume they are happy, and then so am I. And if I don't complain about a record that someone has sent me, then they can assume I am happy with it.
There was no such thing as 'leaving feedback' before ebay.