Lost key and booklet during transit
No worries either way - your dealer is doing the right thing - the Owner's-Manual/Binder has non-VIN stuff in it - no specific info on your rig - and the "lost key" has no identifying marks to tell what rig it goes to - so when either are lost - they're lost and useless.
Your dealer will be paying Mercedes about $180 is dealer cost for Manual/Binder material - which they can take out of any same-model/rig they have on the lot - and use the replacement binder to put in the stock unit they pull it from - and they key is 2nd day delivery - dealer cost is 15% off retail - if this is a pre-owned 2015 - quick programming and you're done - if you have a new 2018 - then programming takes about 1hr... nothing you should be worried about



