(you thought you'd seen the last of me today, but no!)

Chosen Reward: Magical Regain
Regain Details: Papyrus' cellphone! Modern monster cellphones in Undertale include a couple of regular features like:
- texting
- camera
- an app for the monster social network of Undernet
- dimensional boxes (limited hammer space).
I think it's safe to say that the phone is offline, so it has saved texts and photos, and maybe a tab of Undernet shenanigans.
The hammerspace feature is why I'm calling this a magical regain. If it's best nerfed to only a couple slots, or some other kind of limitation, I'm down for that.
(Unlike the most up-to-date phone that Frisk receives, Papyrus' model does not include a jetpack. Tragically.)
Coin: Activity Reward