Savannakhet Non-O (Retirement) visa document question

Moderators, I have posted a similar question in the Visa forum but no one seems to be able to provide a clear answer. I thought I would give the CM forum a go since we have quite a few retirees here who may have actually done a non-O visa based on retirement at Savannakhet.

This question is addressed to anyone who has recently gone to Savannakhet to get a non-O visa based on retirement. Information on non-O visas based on marriage or some other reason will not help as they have different requirements than the one I am looking for.

The requirements set out on the consulate web page are:

Required documents

1. Visa application form [Download] which is completely filled out and signed by the applicant
2. Original passport or travel document (must not expire within 180 days and contain at least two complete empty visa pages) and A copy of passport (The page(s) shows the applicant’s photo, name, date, and place of birth and the expiration date of passport)
3. Two (2) photos of the applicant (3.5 x 4.5 cm, taken within 6 months)
4. Bank statement (minimum of THB 800,000) or Certification of Income (minimum of THB 65,000 monthly)
5. Official letter from the concerned Embassy/Consulate of applicant's nationality
6. Visa Fee: 2,000 Baht (Single Entry)

For No. 5, I have no idea what is meant and no one in the Visa forum seems to know what is meant either. Ubonjoe has provided a translation of item 5 from the Thai version which states: "5. Certificate of retirement from the embassy of that person with that nationality" and which is a bit different than the English version but it is still unclear.

Everything else seems pretty straightforward, however, I would really appreciate any information about what form you used - and that was accepted in Savannakhet - from folks that have actually done a non-O (retirement) visa recently. 

Many thanks

David