[No doubt it was only allowed for two reasons- first, it was a one-and-done and never to be repeated. Second-]

I sent it before getting here; so technically, we hadn't left everything behind yet, not really. We still had our old clothes, our things...

[And anyway-] It was still touched. Handled. ...The bird still came back with it...

[...She doesn't say it but the fact that Josuke appeared as a Foundling himself shattered any thoughts that it could have been a tragedy as well.]