Firstly, did you get an email from them saying that it was shipped? I seem to remember mine having numbers and letters, so I don't think that is it... But, let me warn you that the invoice # SHOULD BE KEPT SECRET!!!!! If you got an email it should be there, or you can ask Tower themselves in an email, ask them what to do, and they might want you invoice, or maybe you deleted the email, or didn't see the number, thats all I can think of...
Do you have any hobby stores near you in Italy??
Have fun with ur truck!!!!
Yan
