Is there a reason to keep dog tags less than level 5?

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You need 14 usec tags (Friend from the west pt 1 and Punisher 6) and 7 bear dog tags (Punisher 6)

Then if you're bear, you need 20 more usec tags and if you're usec, you need 20 more bear tags.

The only other quest that needs tags is trophies which needs them to be lvl 50+.

Keep only 15+

There are daily quests that are turn in a certain number of low level tags, so if u want to have them for that, then do that. There are also low level barters for dog tags too but i don't remember if they are over or under 15 tbh