Question about Samsung PM981a bulk

Short answer to the questions:
- the one installed on the NVMe
- from the OEM (or possibly not at all)
- from the OEM (or possibly not at all)

Reason: the PM981/PM981a are intended for OEMs and "should" not be retail.
They are the OEM equivalent of the 970 EVO / 970 EVO Plus.
PCB layout is 1:1 the same, the EVO PCBs are black, the PM ones are green (is cheaper).

Samsung 970 EVO Plus has
- 5 years warranty
- Support, e.g. firmware updates by Samsung
- Sellable packaging (colourful box)
- manual
- Higher price (currently CHF 105.00 at Digitec)

Samsung PM981a has
- 3 years warranty
- no support by Samsung as the OEM gives the support
- Bulkdwar, so comes without packaging (Digitec packs it in an ESD foil)
- no manual
- lower price (currently CHF 90.50 at Digitec)