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I'm pretty sure that's a mistake. 1.3M are never claimed according to the figures early on, that's 0.003% of the total figure.

Actually it's 0.03% but the mistake is elsewhere. The correct figures are that 1.3M out of 4.36B checked bags (so 0.03%) are lost and never claimed. The infographic incorrectly states "43.6B" (should be 4.36B, to be consistent with the text that see states "4.3B").

Yes, although that doesn't seem correct. That would be 7500 a year.

When they say the founder was buying 3k a month, either the RF ids are great at reducing the losses worldwide, or something is wrong with those numbers.

But it doesn't explain why they can't use the tags to locate the owners. I did find the answer (see my other comment), but it wasn't from this article.