They have arrived!

An email heralded their arrival.
They arrived by tracked postage.
They had to be signed for.
They were in a package that wasn't designed to be opened with any ease.

What were they?

Tickets for the Olympic Games. Quite nicely colour-coordinated I thought.

My husband is taking daughter and son-in-law to watch hockey and volley ball. Not exactly what any of them would have chosen, but he was obviously extremely pleased to have been allocated any tickets at all.