I’m sure it goes without saying for 99% of us - but for the other 1% - make sure the lid you walk out of the shop with is boxed/as far as you can tell - yours is the first head that has been in it/doesn’t look like it’s been tossed around in the stock room etc.
I know you can’t ever be sure something hasn’t happened to it before it has got to you - but having just seen this blog post on Infinity’s site who are currently setting up at the NEC show - I’m more than a little shocked.