What is the usage of 所 here? 「我於五受陰觀察非我、非我所，而非阿羅漢者，我於我慢、我欲、我使，未斷、未知、未離、未吐。」

The above is translated by a Ven. Anālayo as "‘I examine these five aggregates of clinging as not self and not belonging to the self, yet I am not an arahant, with the influxes being eradicated. I have not yet abandoned the ‘I am’ conceit, the desire [related to the notion] ‘I am’, and the underlying tendency towards ‘I am’, have not yet [fully] understood it, not yet become sepa­rated from it, not yet vomited it out.’”

If possible, I would like to know how 所 in 非我所 implies "and not belonging to the self"?
According to Wikipedia:

我所包括我的财富资产、我的眷属(父母、伴侣、子女、亲友)、我的成就、我的世间智慧能力、我的名声等。
我所：意指“我的所有”。

我所 means 我的所有 or my everything or anything that belongs to me.
非 means not, thus 非我所 implies not belonging to me