One UKdeactivated 66mm rocket in said ammo crate.
In the UK we can legally own deactivated items such as this, deactivated to the UK specification and inspected by a proof house with a deactivation certificate issued. Obviously it is just the empty tube which has then been deactivated, inspected and then a certificate issued.
I have obscured a couple of bits on the deactivation certificate for the purposes of fraud/crime prevention.