On an ex2200 running both 12.3R9 and 12.3R12 I see packets with your config. You might want to try posting the whole config as well as output of show interfaces terse, show vlans, and show route.
test@test> show helper statistics
BOOTP:
Received packets: 5
Forwarded packets: 0
Dropped packets: 5
Due to no interface in DHCP Relay database: 0
Due to no matching routing instance: 0
Due to an error during packet read: 0
Due to an error during packet send: 5
Due to invalid server address: 0
Due to no valid local address: 0
Due to no route to server/client: 0