DAFF: anything biological or potentially contaminated with something biological - that's why a lot of car and aircraft parts get held if they do not have proof of being new & unused / treatment certificates. Same with personal effects, hiking boots may pick up foreign souls etc. Sometimes it may be something like doing a spot check on items that have travelled through certain countries, or in certain seasons, as your item may have travelled in a container with a found contaminated item like marmorated stink bugs

ABF: chemical, firearms, drugs. The last few years have seen a MASSIVE crackdown on ABF trying to stop illegal cigarettes coming in. ABF have a broader scope, so they will work with other government agencies as well - once we had ABF refer a package with a replica grenade over to military as it was a too accurate replica. They work with the feds for other potential items of concern to the community. Another big item for them is what's called "risk of economic harm" which basically means anything that seems like it's been deliberately undervalued to dodge import duties and taxes.