I’ve been lucky to have another critter in the garden ID’d.
The pictures I took of the red and black bug which I couldn’t ID but vaguely looked like a Box Elder bug have been identified as a Large Milkweed Nymph. I’ve spotted several of these beasties rummaging around the garden. The smallest of them are about 2mm in length or so.. Very small! This nymph here has probably molted to it’s 4th stage or so before it becomes an adult. I expect to start seeing the adults soon. They don’t look appealing, but they are harmless to humans.
Whatsthatbug.com has graciously identified this critter.