You can check every registered EAC document status on-line following the links below.
(Note: This is Russian national federal register so it doesn't contain the documents issued or organization accredited by Belarus, Kazakhstan, Armenia and Kyrgyzstan)

Accredited organization status

http://188.254.71.82/rao_rf_pub/

cb

EAC CoC (certificate) status

http://188.254.71.82/rss_ts_pub/

coc

EAC DoC (declaration) status

http://188.254.71.82/rds_ts_pub/

doc

GOST R (Unified) DoC (declaration) status

http://188.254.71.82/rds_pub_gost_r/

doc unified