Why the fuck do you worry about taxes now? Especially if you have no intention of cashing out until 50-70 years later... you are around 30 now? That means you'll be somewhere between 80-100. Most likely you'll be dead, if not, most likely the USD you purchased your PM's in will be gone, replaced with something else, if not the value of those receipts would be negligible vs the price you sell the gold and silver for.
In fact most likely you'll live in a post-apocalyptic world where the least of your worries is the IRS.
You stated in an earlier thread that you are a disabled vet. What is your disability, and where did you serve?