And without control of their source IP addresses. They use a "rotating proxy" meta-proxy which sends each request through a different proxy, which invalidates the Anubis response and triggers a new challenge.
Sure, the cheap lock I added to the outside shed's door-latch is terrible and can be shimmed open in two seconds with a bit of flat metal... but the important thing right now is that it keeps the raccoons out. If there's a new threat to the gardening tools or the bikes, then I have a different problem and I'll consider something else.