The reason I post to these type posts is so that I can give perspective to the shop position in a very interpersonal type of relationship. These issues have so little to do with technology.

With that in mind, I would recommend that you do what you want with the memory but leave the invoice alone if you value the relationship with that technician (even as your second or third choice). To bring the issue up for reconsideration is an affront. As a businessman he will probably allow himself to be beat up. As a person you can forget the ensuing relationship.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician