You need to do a bit more digging

Have a look at somewhere like ffordes ( and price up your stuff there

It depends on how much of a relationship you have with the person trying to sell the stuff - 50% of ffordes price for a freind, less for a casual aquaintance

You said it is all in Mint condfition - Mint to a retailer like ffordes usually means you have taken it out of the box and perhaps openned the plastic bag - so only very superficial damage drops its grade hugely

Good luck