If reception means to receive, then anyone who is given the package (receives it) is by default a receptionist. Therefore, if the delivery person hands the package to anyone, they've handed it to a receptionist. /s
But “ist” in this context says that this person does this receiving regularly, likely as a hobby or profession. In which case, OOP would likely know if there was a receptionist that would have taken the package.
So, I’d probably go with receptioner which is more open to uses in situations where the person acted as receptioner this time, but not necessarily as part of a thing they do regularly.