However, you could use some general terms that might fit depending on the context:
* A box of matches
* A pack of matches
* A bundle of matches
* A set of matches
If you're referring to a group of matches used in a sporting context, you could use terms like:
* A group of matches (for a series of games)
* A tournament of matches
* A competition of matches
Ultimately, the best collective noun will depend on the specific context and the type of matches you're referring to.