Short of going through whole dumps and looking, is there a good way to
get statistics?

Hi David,

I don't believe reordering is tracked on the receiver side but on the
sender, there are SNMB_MIB items.
They can be tracked and can be viewed using nstat/netstat

# nstat -az | grep -i reorder
TcpExtTCPFACKReorder            0                  0.0
TcpExtTCPSACKReorder            0                  0.0
TcpExtTCPRenoReorder            0                  0.0
TcpExtTCPTSReorder              0                  0.0

Regards,
Vijay