[Alz007]

If I'm asked I'll say and if I'm not asked I won't say.

Correct.

Put simply, don't provide anymore details than you need to.

I will contact them tomorrow by phone then!

Good move.

A lot more can be said and done over a phone conversation.

Thank you very much and I will keep you informed of the progress

You're welcome.

One last thing just to be sure: do I specify that I know the package is marked as delivered hence my call or do I totally pretend I don't know anything about it and just say I still haven't received the package (And I would say I haven't seen the email from the carrier asking for my opinion on the delivery afterwards when the rep will tell me about it)?