Help with dog tags translation

[Onryo]

Hi, a person is trying to translate these and if possible return them to any living relatives. Any help would be greatly appreciated.

 

[Majestic]

Not sure about this at all because it looks like some marks have been added later. It looks like the dog tag on the left says (from left to right).

番一五七 = Number 157
中騎旅（コ）四 Chu Ki Tabi (ko) 4 I think the コ (ko) is a later addition
騎一五 Ki 15

Usually Japanese dog tags just have battalion unit numbers and functions, and no names. I would assume "157" refers to a battalion or squad number. The kanji 「騎」is used for horse-riding, so if I'm not mistaken I think the rest of that tag would indicate 15th Regiment of the 4th Cavalry Brigade.

The tag on the right is upside-down, but it says
番三六 = Number 36
一兵站四 = 1 Heitan 4
Heitan means Military Logistics. So this tag would be something like "1st Military Logistics Unit, Section 4"

Finding relatives would be a real challenge since there are no names on Japanese dog tags. The Japanese government (Ministry of Health, Labor, Welfare) has records and lists of various units, so contacting them is one idea (but a longshot).

 

[Majestic]

Another idea: there is a link to an organization that tries to repatriate WWII flags. They might be able to help. I can't verify anything about this group, so proceed with caution.

OBON 2015 「寄せ書き日の丸」返還運動