I use it whenever I'm forced to fly WN and have never been asked for anything other than the normal receipts/boarding passes. Sounds like they mistakenly think it's some kind of 'class of service' upgrade instead of just priority boarding (which is all it really is anyway). Oh, and a free drink too.

I would call your ACP and let him work it. I will look around and see if I still have a copy of the email/FCIF.

Maybe the company is just warming up the precontract PHP, but it seems a bit early.