[PonySoldier]

Small correction on your first sentence: only one (the huge one shot down off the coast of SC) was confirmed to be a spy balloon from China.

The other three (Alaska, Yukon, Lake Huron) were explicitly referred to as "objects, not balloons" initially. This was later updated to "intelligence agencies believe they were civilian research platforms/balloons" but not from China. That seems to be where the story ends with no further updates. Feds say that no debris was ever located for any of the last three.

Off-topic and/or pedantic but I followed the story pretty closely and don't understand why people lump the first shoot down (of the confirmed spy balloon from China) with the latter three. The circumstances and details emerging in the aftermath were wildly different.