From a computer store that closed in the 2000's. This memory is from a collection that was stored across several anti-static bags (some factory sealed). Open bags often included slips of paper with dates and "tested ok" notes. I have been processing this store's inventory for years now, and can say with authority that they ran a tight ship and generally did not keep around things they had either not tested or were not actively selling on shelves. RAM used to be a lot more expensive back in the day, and it's obvious this collection was tracked carefully and tested prior to being saved/stored. I have done spot checks here there with my CST SP3000 Innoventions SIMCHECK testers, which have further confirmed this hypothesis. That said, I have not personally re-tested every one of these sticks so I am listing them as UNTESTED. It has been a unique experience reviewing this inventory- like wading through a giant time capsule. If you are interested, please check out my other listings, including many items still in their original packaging. Thank you for stopping by. Have a great day!