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proof-of-purchase

[proof-uh v-pur-chuh s]
noun, plural proofs-of-pur·chase.
  1. a sales slip, label, box top, or other item associated with a product that is presentable as evidence of actual purchase, as for claiming a refund or rebate.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018