Bearing Wall

After measuring a house for a space planning job I have a closet with the walls as shown. How can I know if these are bearing walls? I want to use the space for a new layout.
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If the wall continues throughout the entire space, you could be sure it’s load bearing!
They prob put there storage due to it’s unnatural shape. some older houses have such spaces for the electrical wiring…
The only way to be sure is either to look at the original structural layout, or to rip the sheetrock…

This space might be used for mechanical, electrical or plumbing. so after gutting the house you can see if its not a structural wall, and client doesn’t mind moving MEP etc…