I use a photo album to keep my receipts organized. I use the kind of album where I can add more sheets to it as needed. And each sheet has 3 slots in it. Into the top slot I put the purchase receipt, then any receipts for parts or maintenance on that item I put in the slots below and behind it. At the top of the sheet I put a removable tag so that I can find the sheet I'm looking for easily.
Since starting this method I haven't lost any receipts (and I used to lose them constantly!)
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