They may have been in use before.
The support can tell you that from the serial numbers.
I suppose it’s possible, but I bought them new in box from an online computer parts store (FrozenCPU). The clear sticker that Aquacomputer puts on the box top was still intact and the accessory cables were still sealed in their bags. It’s not a big deal, but out of curiosity I will send the serial numbers to Aquacomputer support and see what they say.