How do you determine if a samsung SSD is a retail unit or an OEM replacement part?

about 2+ years ago i bought a samsung SSD model 810 off ebay - worked fine till about a couple months back, and it was slowing down - crystal disk mark showed it at "82%" condition.

It was corrupting boot files and wouldn't boot up - needed a rescue disk to boot 3 out of 5 tries. So i did a clean install of everything only to see the issue return shortly after. Contacted Samsung and as soon as the tech service rep heard "Model 810" - he said that that was a Dell OEM unit and i'd have to contact Dell for support, which as i hadn't purchased it from dell, my chances were zero.

Then i recalled a thread here (couldn't find it) that the OP had bought one of the new samsung M.2 XP941 SSDs to try it out and hadn't seen the speed increase over his other sammy SSDs so he sent it back, as it was sold as a "replacement part" for the OEM mfgr's original model PC, and as such said it had zero warranty.

Last night went looking at 500 GB sammy SSDs and noticed on Newegg, some units priced $35-$60 lower than others, slightly different part number but samsung nonethless - and it hit me, could the lower priced units be SSDs that are "over-production", either from samsung, or excess stock from distributors that newegg got at a better price than their normal "retail" sale units?.

Obviously if it's a samsung SSD being sold with a USB to SATA adaptor, then it's a retail unit, but how do you know otherwise?

just interested in not getting bit twice
 
Solution
Simple, the retail units can be purchased directly from Samsung's website, as long as they aren't EOL.

Samsung's Retail SSD range are the 470, 830, 840, 840 PRO, 840 EVO, 840 EVO M-SATA, 850 PRO, 845 DC EVO, and 845 DC PRO. Samsung is coming out soon with the 850 EVO, 850 EVO M-SATA, and the 850 EVO M.2.
Simple, the retail units can be purchased directly from Samsung's website, as long as they aren't EOL.

Samsung's Retail SSD range are the 470, 830, 840, 840 PRO, 840 EVO, 840 EVO M-SATA, 850 PRO, 845 DC EVO, and 845 DC PRO. Samsung is coming out soon with the 850 EVO, 850 EVO M-SATA, and the 850 EVO M.2.
 
Solution