they are not in Lib Scacc - the index to the deeds consists of three or four parts
(a) those entries found in lib vas, lib scac etc - you can see these on my index pages usually tagged as deeds pre 1704 - these deeds were filed in the various places pre Act of Settlement
All subsequent index entries refer to deeds entered post Act of Settlement when every transfer of property had to be registered; though for some in the Old Deeds sequence they refer to transfers pre 1704
(b) those deeds entered prior to May 1723 - these are numbered, in random sequence, by parish in which the land concerned lies - these are Old Deeds
(c) post 1722 (though most of early 1723 deeds were lost! by the Rolls Office - these are now numbered - in a single sequence ordered by parish and entered by year of passage through the court (tho the transfer can be several years in the past)
The indices to all these were constructed about 1825 - I suspect given some entries from earlier indices - those deeds that deal with land in two parishes can appear in two places in these indices
(d) starting around the late 1780's but increasing post 1800 there are 'enrolled deeds' in which the ceed was transcribed into a book rather than existing as a collection of loose papers
Post 1840's the deed filing system changed and a new set of indices constructed to tghese

There are of course other twists and convolutions on this - eg Castletown deeds

If you have read this far then the Lib Scacc came from the heading of the pre1704 deeds and someone just transferred this by implication to the old deeds which run on after these without a heading - under the same argument then for some parishes the last heading would be Lib Vas