They sure been advertising the lost episodes in a promo ad like they were and like they are now, but The only episodes i seen air are the episodes before David Canary and Jamie Cartwright ever join.

When they say lost i thought they mean the one when Jame Cartwright came into the picture.

the lost episode are from seasons 7 to 14 which span the years 1966-73. Jamie didn't join the cast until the last season which was 1972-73.