Some TV & high end electronics manufacturers have strict policies such as only honoring a product warranty if the item is purchased directly from an authorized reseller as they don't want other vendors selling items at a discount which hurts their authorized partners which sell the product at higher margins. Usually warranties from these companies will only apply to the original purchaser which would be the unauthorized reseller. I'm not aware of Crucial doing this, but I may be wrong.
If you contact Crucial for a warranty replacement and you don't have a receipt, they can try to look up the part serial# in their database to see if they have a record of it. I had to claim a warranty on memory one time because it was not purchased directly from Crucial & I did not have the relevant information (I don't recall how we acquired the memory originally). I had no problems getting it exchanged as they had a record of it in their system. If a verified purchase date cannot be found, then many companies will base the warranty period on the date of manufacture.
You can check out the details of Crucial's Warranty policy here.
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