I ordered filters from EBay that were supposedly genuine Samsung parts. The packaging and label appear to be authentic and identical, including holographic seal. However, the replacement filters don't install properly and eject when water is turned back on. I reinstalled the original (old) filter and purchased a new one at Lowe's. Both fit and work properly. I'm sure I'll need to prove to EBay/seller that the product they sold is inferior so that I can get a refund.
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They were advertised as "genuine" parts, had the holographic seal, and even had multi-page instructions inside the box (more detail than any counterfeiter would need to go to, in my opinion). Nothing seemed "off" or "fishy." For my own benefit of the doubt I'd like to hear what Samsung has to say about this particular instance and whether they ever have experience with defective parts.