Just max'd out a friends PowerMac G5 (DP2.3) and had these two sticks left over. His machine ran perfectly so I think it's safe to assume that the memory is in perfect working shape. They are marked with an "M" logo assume Micron manufactured.
Not sure what the going price (none posted here), but based on the price for new memory ($39 for each stick of Samsung at OWC) I think $45 for the pair shipped and paypaled would be reasonable.
Thanks