[mothered]

Only signature, yes.

Are you closely associated with anyone at reception? Meaning, will he/she work with you during the SE?

If not and given It'll be dropped off and signed using real credentials, It will complicate the SE- due to the fact that others will be Involved and the consignment marked as delivered (via the real signature). You can opt for the wrong Item received method or depending on the packaging/box, the sealed box method will also suffice.

Alternatively, you can box them by adding a weight substitute equal to the phone. There's another method available named "the wrong Item sealed box method", whereby you claim that you opened the sealed box and It contained another Item Inside- completely different to the original. This method was personally developed, formulated and titled by me whilst writing a tutorial on my blog.

As you can see, there's quite a few methods to choose from.