AN MD80 CREW DEPARTED STL WITHOUT PROPER DOCUMENTATION OF PAX COUNT VERSUS PAX CHKED BAGS.

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WHILE OPERATING A SCHEDULED AIRLINE FLT FROM STL TO DTW; I INADVERTENTLY TOOK OFF WITHOUT OBTAINING A FINAL WT CLOSEOUT SLIP. THE FIRST EVENT IN THIS CHAIN WAS BEING INFORMED; JUST BEFORE DEP; THAT THE AGENT COULD NOT INPUT OUR FINAL PAX COUNT INTO THE COMPUTER SYS BECAUSE OF A TECHNICAL PROB. BECAUSE OF THE DELAY WITH THE FINAL CLOSEOUT WT SLIP; GND HAD US PULL OUT OF THE DEP SEQUENCE. THE LOAD AGENT INFORMED US THAT HE WOULD HAVE TO WAIT FOR THE COMPUTER ENTERED PAX COUNT SO THAT THE COMPUTER SYS COULD RECONCILE PAX INFO WITH PAX CHKED BAGS. THIS IS DONE OUT OF CONCERN FOR FLT SECURITY. THE FO TOLD THE LOAD AGENT THAT HE WOULD MONITOR HIS FREQ. WHILE THE FO WAS DOING THIS; I DECIDED TO CALL UP AND PRINT A NEW TKOF PERFORMANCE SLIP VIA THE ACARS SYS. A MIN OR 2 WENT BY AND THEN I HEARD THE ACARS PRINTER RUN. THE FO TOLD THE LOAD AGENT THAT THE NUMBERS WERE PRINTING AND THANKED HIM SIGNING OFF. WE SET THE ACFT STABILIZER TRIM BASED ON THE DATA; CHKED THE GROSS WT AGAINST THE MAX TKOF WT AND THEN COMPLETED OUR CHKLISTS. AFTER INFORMING ATC; WE MADE A NORMAL TKOF AND DEP. AFTER LNDG AT DTW; A COMPANY AGENT TOLD ME THAT MY DISPATCHER NEEDED ME TO CALL AND SPEAK TO HIM. HE INFORMED ME THAT THE LOAD CTL SUPVR HAD CALLED AND INFORMED HIM THAT I HAD DEPARTED BEFORE THE COMPUTER SECURITY RECONCILIATION WAS COMPLETED. AFTER CONFERRING WITH THE FO AND LOOKING THROUGH MY FLT PAPERWORK; I DISCOVERED THAT I HAD MISTAKEN THE COMPUTER TKOF DATA SLIP (THE NEW ONE I HAD REQUESTED) WITH THE OFFICIAL LOAD CLOSEOUT SLIP. REALIZING MY ERROR; I INFORMED MY COMPANY DUTY MGR ABOUT WHAT HAD OCCURRED. SINCE THE TKOF PERFORMANCE DATA WAS GENERATED AFTER THE LOAD AGENT HAD ENTERED THE PAX COUNT WE PROVIDED; THE GROSS WT AND CTR OF GRAVITY WERE CORRECT FOR OUR TKOF. THE OFFICIAL CLOSEOUT WT SLIP HAD NOT PRINTED BECAUSE THE PAX/BAGGAGE RECONCILIATION WAS NOT COMPLETE. THIS CAUSED A VIOLATION OF NEW SECURITY PROCS. CONTRIBUTING TO THIS INCIDENT WAS THE RECENT PURCHASE OF MY AIRLINE BY ANOTHER; LARGER CARRIER. WE RECENTLY SWITCHED TO THIS NEW COMPANY'S COMPUTERIZED WT AND BAL; AND TKOF PERFORMANCE SYS. THE TKOF PERFORMANCE SLIP AND THE WT AND BAL CLOSEOUT SLIP ARE SIMILAR IN APPEARANCE; AND WHEN THE PRINTER STARTED; THE FO AND I MISTAKENLY ASSUMED THAT THIS WAS THE FINAL WT SLIP THAT WE WERE WAITING FOR. WE SAW WHAT WE EXPECTED TO SEE. IN THE FUTURE; I WILL NOT FALL INTO THE TRAP OF ASSUMING THAT CERTAIN ACTIONS WILL ALWAYS RESULT IN THE EXPECTED RESULTS.