[quote=@Raineh Daze]
Sitting here wondering how Guts is going to get it off of the person in school least likely to approach him, given how she is with people.
[/quote]

Casuality. A Behelit always returns to its user, by manipulating probability. Griffith's got lost in a sewer for a year, then he found it in a riverbed. If Guts loses his, he'll get it back some way or another.

This is covered in the manga.