How to tell a 2023 vs 2022

Ok I bought an X11 that is supposed to be a 2023 model. I noticed the the front scrubber are discolored and I am worried the seller did a switch and put sold me a 2022 model year even though he list 2023 year. Sorry I am new here can anyone help me please? Is there a way to check by serial number etc?

I was asked to return a defective unit that I told customer service I would send video of and then discard because I’m concerned Smorobot may be refurbishing units. There’s something shady going on. It’s taking forever for them to send a refund to me. I’ve returned three robots now.