Same here. Have the My Verizon app because it was on my other phone and transferred over on setup. So I don't know if it was already on this Pixel but I am doubting it. Also was able to pull down the March security update as soon as I saw it was available. That's a somewhat new experience.
Have a replacement Pixel on the way. Will see if anything is pre-installed.
It's listed as a Verizon variant.
EDIT:3-21; Just got my replacement. There was a Verizon sim preinstalled into the device but no software specific to Verizon was installed.
Quite sure if I had booted with Verizon sim, carrier specific apps would have downloaded and installed.