That depends on the requirements for that particular shop.  If you need a GPS verifier code for your shop the evaluation will prompt you for it, but if you're filling out the eval after the fact it may be too late.  Some companies will warn you that you need the code, others might not.

It's good practice to always grab a verifier code while you're on site, name it something specific (so you know which shop it's for) and then you have it if it turns out that you need it.