hi 
found these births for john and sarah boswell apart from francis john,s occ is shoemaker on francis birth his occ is labourer .
William bpt 18 may 1817 born 23 apr 1817 
francis  bpt 24 oct 1819  born 1 oct 1819
james  bpt 28 apr 1822  born 18  ?  1822 can,t decipher month 
sarah  bpt 23 may 1824  born 14 mar 1824 
matilda  bpt 26mar 1826  born 3 mar 1826  on this bpt place of abode is Theydon garnon [in reg as guernon ] still in epping dist , all other birth abode is epping .
hope this helps .
trevor 
ps did check reg up to 1830 but no other births show .
does the list correspond with what you have found re names of children ?