Putting aside the situation with Delta Upsilon for a moment...
Of the groups that you mentioned (and others),
The Philippine groups which appear to me to be unquestionably stealers are Phi Beta Kappa of the Philippines (lawsuit from Phi Beta Kappa-USA in progress) and Sigma Alpha Epsilon of the Philippines (multitudinous evidence given by SAEalumnus here as well as other things I've found).
Alpha Phi Omega never stole. Even when relations were most cold after the sitaution with Ferdie Tabtab, APO-Phil still had the full permission to use all symbols and rituals.
Alpha Sigma Phi, there were issues at the beginning, I don't have a good feeling for when between the formation of the first group in the Philippines in 1959 and the formation of the International Council in 1984 that Alpha Sigma Phi of the Philippines gained the rights to use the symbols from the North American Groups.
(As far as I can tell if things do work out with DU-Int'l, that Delta Upsilon would be most similar to Alpha Sigma Phi of the ones here.)
I have *no* idea on the official relationship between Demolay of the Philippines with Demolay in the USA. I'll call the USA HQ today to ask.
Pan Xenia, the information that I've found indicates that, yes it was founded in the USA, but that all of the USA chapters (U of Washington, U of Oregon and U of Illinois) went under during or just after World War II and there does appear to be a legitimate link from there to the Philippines chapters.
This is as opposed to Fox Theta Delta which claims to have been founded in East Lancing[sic], Michigan in 1901 that even the Archivist at Michigan State can find no trace of.
Sigma Nu is also iffy, while it is quite clear that the USA National Fraternity does not recognize them, what is unclear is whether the group in the Philippines is claiming to be part of them.
And there are duplication of letters that appear to be completely innocent. To pick two from the Wikipedia page: Omega Phi Delta where the USA group is younger (1990 vs. 2006) and Sigma Xi (Xians in the Philippines) (Scientific Honorary in the USA)
If you have additional examples of groups with these sorts of ties, I'll be happy to research them. (I'm a volunteer on both Alpha Phi Omega(-USA)'s History and Archives Committee and Alpha Phi Omega(-USA)'s International Relations Cmte, and I also am responsible for most of the references on the Wikipedia pages so I've done this research before.
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