Here are the div id for each metabox to add into Native Custom field:
Here's is a list:
Post submit meta box:
submitdiv
Post tags meta box:
tagsdiv-post_tag
Post categories meta box:
categorydiv
Post excerpt meta_box
postexcerpt
Post trackback meta box:
trackbacksdiv
Post custom meta box:
postcustom
Post comment status meta box:
commentstatusdiv
Post comment meta box:
commentsdiv
Post slug meta box:
slugdiv
Post author meta box:
authordiv
Post revisions meta box:
revisionsdiv
Page attributes meta box:
pageparentdiv
Link submit meta box:
linksubmitdiv
Link categories meta box:
linkcategorydiv
Link target meta box:
linktargetdiv
Link xfn meta box:
linkxfndiv
Link advanced meta box:
linkadvanceddiv
Post/Page thumbnail meta box:
postimagediv
Here are the div id for each metabox to add into Native Custom field:
Here's is a list:
Post submit meta box:
submitdiv
Post tags meta box:
tagsdiv-post_tag
Post categories meta box:
categorydiv
Post excerpt meta_box
postexcerpt
Post trackback meta box:
trackbacksdiv
Post custom meta box:
postcustom
Post comment status meta box:
commentstatusdiv
Post comment meta box:
commentsdiv
Post slug meta box:
slugdiv
Post author meta box:
authordiv
Post revisions meta box:
revisionsdiv
Page attributes meta box:
pageparentdiv
Link submit meta box:
linksubmitdiv
Link categories meta box:
linkcategorydiv
Link target meta box:
linktargetdiv
Link xfn meta box:
linkxfndiv
Link advanced meta box:
linkadvanceddiv
Post/Page thumbnail meta box:
postimagediv