Blue lid ONLY. when i was a kid me nana used to get me a pint of silver top off of the milkman. it had cream in the top of the bottle. i havn't seen silver top in glass bottles in about 20 years though.
Yeah silver top is the cream of the crop, literally.
If you live in a nice area CE, there's less than zero chance anyone's going to mess with your milk anymore than they would were you to buy it from a shop, and getting slightly warm isn't going to be harmful in any way unless you leave it out for a day or two. Milk doesn't need refrigerating that urgently.