please help me identify this light leak

[Vaughn]

My guess is fogging during some part of processing.

[mpirie]

Is it possible that the fogging has come from the x-ray during shipping?

I know you said the film was in an x-ray pouch, but i have heard of examples where the x-ray machine operator just turns the power up to "see" into the pouch to make sure it's not contraband.

The shadows could be metal parts of the pouch?

Mike

[cowanw]

I didn't process these myself so I can't tell.

Can you ask the developing person to show you or tell you how they are done?

[aaronnate]

Are these from the same pack of film?

At anytime was there a rubber band around the box you transported them in?

Can you post a cell phone pic of the box you transported the film in?

Send an email to the processor with the pics and see what they say.

[Pfsor]

Is it possible that the fogging has come from the x-ray during shipping?

I know you said the film was in an x-ray pouch, but i have heard of examples where the x-ray machine operator just turns the power up to "see" into the pouch to make sure it's not contraband.

The shadows could be metal parts of the pouch?

Mike

First of all, to the OP - a question of nomenclature - I don't see any light leak in your example pictures. Light leaks are usually just that - light. I see a dark signature.
And yes, I agree with Mike. Me too I heard of the cranked up power used by x-ray machine operators (I have seen it too in practice). To use an x-ray safe pouch in carry on luggage to hide something in front of x-rays is just a plain invitation to get more attention and more curiosity on it to know what the pouch hides. Fortunately so, otherwise whatever sicko could take onboard its dose of sick medicine to solve world's problems!
So yes, I think Mike is right, what we see is something pressed close to the film box and x-rayed gladly.

[Jeroen]

Modern x-ray equipment has been safe for film for 20-30 years, but when an X-ray operator can't see through your lead bag, he/she simply increases the dose. That often results in a worse effect than without a lead bag.

[cowanw]

Does xray cause exposure to the red layer of the film?
Kodak says this
https://www.kodak.com/global/en/serv.../tib5201.shtml

X-ray Fog Appearance
Fog caused by the new baggage scanners is usually more pronounced than fog caused by other means. Fog from the CAT scan type of scanner typically appears as soft-edged bands 1/4 to 3/8 inch (1 to 1.5 cm) wide. The orientation of the fog stripe depends on the orientation of the film relative to the X-ray beam. The banding may be linear or wavy and can run lengthwise or horizontally on the film. It can also undulate, depending on the combination of the angle of exposure and the multiple laps of film on the roll. (See images below.) However, the fog will usually lack the more subtle patterns produced by traditional types of X-ray equipment. Additionally, whether or not this stripe is seen in the photographic print may depend on scene content. Busy scenes with flowers, foliage, etc. may obscure or lessen the perception of X-ray effects.
Fog appearance:
On black-and-white negative films - Dark areas in patterns as described above.
On color-negative films - Dark areas with neutral or brown patterns.
On color-reversal films (slides) - Minus-density area (light patches) with patterns as described above.
Fog from the full bag, high-dose scanners affects the whole negative, causing the entire image to appear overexposed and grainy. Dark or black images might appear green.