Here is mine, not quite the oldest of the bunch, but 2 years is still quite the time.
If you’re searching for the ultimate oldest unnamed familiar, it’s got to be the familiar with the Crow/Bunny familiar line. Those are known to be the oldest of em all.
cjzyz said that (s)he owned a 2017 unnamed ghost familiar
Edit: oops, I misread it actually, it wasn’t purchaed the first day, it was purchased the first time it was released, my bad
Link: Selling some rare items (and familiars)
Didn’t realise you have forum acc too. Anyway for those old player I think it’s normal to have very old familiar. Mine was the one when Valentine familiar came out and I was so excited about it. Bought one and kept it until now, never named it and never going to sell it. Pixel bot was the second one haha