Hi,
I'm not sure they would be able to help (I hope you can prove me wrong) when doing a search for my stalwarts history I had to send a cheque for £25 (non refundable if no records found) to military vehicle museum, (I believe it has now changed location) but as the 404 was not in UK service you won't find its history through the usual UK channels. It will either be ex German, Belgian or French army.
I wish you luck.
Cheers
Shaun