One thing..
That really does make me think, that All may have had Sodium Perborate in the formula, is the fact, that I've located patents from Lever Brothers for Detergent Compositions containing them.
To be Fair, I myself don't have any of it on hand, nor, do I claim it contains it, but it wouldn't surprise me if it did.
One Has to Remember, Company's really aren't required to list everything in there products. Some just release enough information, on boxes, or list only the "harmful" ingredients on Material Safety Data Sheets.
And if I recall correctly, a segment I watched, from the 60's? 70's? said that none of the detergent manufacturers listed there actual phosphrous or phosphate content, they had to have it individually tested to figure out the contents.
The only time they'd actually have to release such information, is if a Doctor Office, or Physician contacted them.