Big issues: they'll probably refuse, unless you've used the specific papers available to roll them up in, written your name and address on each roll, and made sure there are the correct number of coins per roll as indicated.

There must be millions of CHF sloshing around the nations drawers, as who - but the bored / skint - can be bothered to do this?

On that note, if you'd like to offer a bored / skint person a bag of coins, for a 50% commission I know someone who'll do it for you