How do you find out which Extended Art Commander cards will be foil?

Hello. For awhile now they have printed the new Commander pre-con cards in Extended Art non-foil into Collectors Boosters. I personally noticed for the first time with Commander Masters that I was able to get a foil, extended art [[Composer of Spring]] and [[Hatchery Sliver]].

Then in Wilds of Eldraine I got an extended art foil [[Court of Vantress]] but not a [[Misleading Signpost]]. What gives? I looked through the Collecting The Lost Caverns of Ixalan article, it says LCC cards are available in traditional foil and non-foil Extended Art (Rare and Mythic), but the same as last time it doesn't indicate which cards.

I would love to collect some of the new Pre-con Dinos in Extended Art foil. Does anyone have an idea how to tell?