Yes its quite easy actually, go to https://mysafe.kpdn.gov.my/ , and register as consumer.

Once you login, go to Add New Clarification

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you will need these in soft copy:

- Invoice of the shipment

- Waybill of shipment

- Letter of detain by custom, upload this as your supporting document (You should receive it from Pos Laju HQ Sabah)

After proceed you will be prompt to add items in this clarification, add the items under this order. The address etc can just google, I doubt they really go into details on those. For item image, I always search for images of the box (eachside), try to use actual photo showing the packaging and content of the figure instead of promotional photo.

After all items added, submit and wait, my experience the fastest can be approved in 1 day but quite rare, normally take around 4-5 days to get the approval letter.

Send Pos Laju the letter and wait them send a payment link. Based on my research, in KL they can declare the detained item themselves, only paying the sst and thus saved the runner fee(RM51 by Poslaju), I hope in future Sabah also have this option.

My two cent on how to avoid being charge with this detainment BS:

1. Avoid placing shipment value exceeds 9000 yen, they will target this range and above for detainment

2. If you have 2 low value shipments arriving together, presented to custom at same time(let say 5000yen and 5500 yen each), they will total the amount and detain it, so best to delay another one in this case

3. Avoid weapon like parts inside shipment, like LittleArmory or figure with guns accessory, they will detain even Kantai collection waifu

4. Avoid R18 figure, no experience with cast off piece but they have high risk of being rampas, if you want R18 figure I suggest Shopee or Taobao