You must travel with your I-194 Waiver at all times, and losing it can be quite costly and time consuming to replace. You will need to submit an I-824 with an explanation as to why you need a replacement for your I-194 Waiver document. It will also cost another $405US for the replacement fee of the I-194 waiver, in addition to the $585US that was already paid when you submitted your I-192. As you can see, this is quite a hassle, as well as costly. It is imparitive you keep your I-194 in a safe place and you travel with it each and every time you cross for the duration of your waiver. It will not remain in the system that you have been approved, and you need the I-194 to travel or you will likely be denied and turned away at the border with instructions to obtain a replacement. Your I-194 waiver document must be valid when applying for a replacement document of course, and if you have less then 6 months left before your waiver expires, you may want to consider resubmitting a...