Another option is to use holographic security labels. They are not expensive. I attach them to ram, several to the seams of any device that can be opened such as hard drives, power supplies, disc drives, etc. I warranty any item I sell for 30 days. I include an instruction sheet with my shipment that simply states the terms and length of my warranty along with warnings that if any of the security labels are removed or tampered with, the warranty is null and void.
I also record all serial numbers.
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