I somehow doubt that they are true refurbs. Not in these numbers. Probably nearly-unsellable New Old Stock, or the found a bunch of these GPU dies cheap somewhere and made a cheap run of cards with them. (Though, given memory prices, and these have 1GB of GDDR5, that doesn't sound so cheap to me.)
(I've run into this quite a few times with SSDs, being sold as NOS, without warranty, as a "factory refurb".)
Edit: I've learned that these may be the same card, effectively (but with different firmware or signature) as a GTX640 1GB GDDR5 card. Maybe that's what these are, unsold GTX640 cards, re-flashed and sold as refurb without warranty as GT 730 cards.
Either way, I found a video on YT that purported to be from a rig running a GT 730 1GB GDDR5 card, and it looked plenty playable at whatever settings and on whatever CPU that they were running. (Likely a quad-core of some sort, or better.)
That was really promising, to see that you could even play GTA V on a GT 730 1GB GDDR5 variant at all.
I think that it will make my pair of Ryzen 3 1200 rigs running at 3.80Ghz happy campers, they should play GTA V fairly well, even if you have to turn down some graphical effects.
Realistically, I should be putting in GTX 1060 3GB GDDR5 cards, but with prices what they are, these are more "productivity first" (with M.2 PCI-E SSDs), and "gaming second". Would remove the OC if selling to businesses.
Should be decent though. Also looking forward to dropping a pair of these into my relatively ancient Core2Quad rigs. I've got GT 630 (Kepler, GT 730 equiv.) cards in there now, 1GB DDR3-800 RAM. No good for gaming.
Got a pair of R7 260X 2GB cards to drop in too, if someone needs more "gaming grunt".
Sold all of my GTX1050 and 1050ti cards.