Japan Post Bank- “Inquiry about international remittance”

Hey everyone,

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My mother send me a chunck of money, around 11k$, to my Japan Post bank account.

I did receive an interesting letter from Japan Post Bank today, saying that they will withold that money untill Ive sent them additional documents. The documents they were asking for are a copy of my Student ID and Residence card, a document proving the relation between me and my mother, and a copy of my mothers ID. I also had to answer a few questions if the money was used to finance Irans or North Koreas nuclear/missile program.

I did send them all the documents asking for it, but I was just wondering if anyone else had any experience with that? It stated in the letter it could take up to a month for confirmation, and that they still could deny the charge.

Also, since I am from a non-English speaking country, the document I sent them confirming my relation with my mother (my birth certificate) isnt in English, would that be a problem? It shows both my and my mothers name clearly, but Im just wondering if they’d deny it, since it isnt in English. (its not a hard to understand document though, the entire certificate has maybe 3 sentence or so)

In general, are these checks a serious matter or more of a formality?

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Thanks in advance for any help.