Hi I have just purchased a 2006 Copen, but didn't get a remote central locking fob. do all copen models have remote central locking as standard.
It might be expensive but an ex daihatsu dealer could probably get one for you, they occasionally come up on eBay but then you have to program it to your car. it's worth keeping an eye out though.
The fob, from a dealer or high end third party car locksmith, is about 120 EUR. It looks like the fobs from Japan use a different frequency - I've about four of the damn things to prove it.