Keep it short and simple. If the guidelines do not require a trade evaluation, then do not include one. Just say you are giving your car to your brother/uncle/niece if that's easy to remember. Say you are keeping it, that's easy. Then move on. Do not say anything else because that either answers something they haven't inquired about yet or turns the sales persons attention in the wrong direction. For example, volunteering you have a down payment might mess up your guidelines and get your report rejected.
As far as checking the glove box; just like the next customer will expect to have an owners manual the dealer will expect to know if it's there or not. They are not cheap to replace. A good evaluation can take 20 to 30 minutes, including researching auction numbers.
I estimate about 30% of my customers forgot about an accident when they told me no accident history yet we informed them of painted panels. About 20% own cars with previous repairs that are not on the history report and they were not told about (or they forget being told about) when they purchased the vehicle.
KBB is a guide, they do not buy or sell cars. About 40% of the retail values they provide are well above actual market values. That means about 40% of the trade values are too high. NADAGUIDES is a better tool, just like any tool you have to understand how to use it.
My posts are solely based on my opinions and for my entertainment, contact a professional if you need real advice.
When you get in debt you become a slave. - Andrew Jackson