I believe our records are being checked upon their discretion, and if not by them directly, then by a 3rd party they hired.
I have a few experience on background checks overseas for my skills and education assessment para sa work sa singapore. While others do not disclose the report, others do send a copy of the screening report to the applicant. May history din kelan sila nagverify and nagfollowup at kung kanino, it depends on the party that will check. I received a report they checked my education with the university, they (3rd party staff) even went onsite to confirm because Registrar is not replying to their email.
In general ang point ko lang, these kinds of assessment esp for migration purpose are not bara bara lalo na for overseas applicants na kelangan talaga iverify, kaya nga medyo mahal ng bayad sa ganyang assessments/screening. Talagang nagccheck sila, hence may mga natatagalan sa results. I just don't want complacency on this kind of stuff.
As for the reason na ilalagay sa work reference letter, depende talaga sa kanya kanyang situation yan eh. Ako tinanong ng current employer ko para saan and kanino iaaddress. So wala akong choice, talagang for ACS ang sinabi ko and for skills assessment. Wala naman na silang ffup question. Bahala na sila mag isip. Siguro sa pinas talaga may mga masyadong nosy na HR haha.
Ewan ko din and baka too much of an advice na, hindi ako nagrun for promotion sa work when I decided that I want to emigrate. While others can do both in parallel, ako, i couldn't. It's just focusing your energy sa gusto mo talagang mangyari sa life mo. Again, kanya kanya talaga.