@allanb - aside from the generic COE, you may also include anything that reminds you of your previous work.
hindi ako gumamit ng affidavit dati kasi walang nakapag-advice sa akin non (hehe), but i included training certificates (from both in-house training and outsourced training na sponsored nila), evidence nung work ko (may instrument akong hawak and i have kept 2 hardcopies of its picture, hehe). ok naman. no questions asked from EA/DIAC.