This needs references. As far as i searched i could not find.Hanuman went to south and to him Mahendragiri was mentioned and chera chola pandyas were mentioned.Pandya country, agasthya, tampraparani all mentioned but not kapatapuram. This can be read from the below. http://www.valmikiramayan.net/kishkindha/sarga41/kishkindha_41_frame.htm
Kapadpuram was told to the Person who went to west. There is no mention of Pandyas there.
tatra siitaam ca maargadhvam nilayam raavaNasya ca || 4-42-12 velaatala niveSTeSu parvateSu vaneSu ca | muracii pattanam caiva ramyam caiva jaTaa puram || 4-42-13 ava.ntiim a.ngalepaam ca tathaa ca alakSitam vanam | raaSTraaNi ca vishaalaani pattanaani tataH tataH || 4-42-14
"Seetha shall be searched along with the residency of Ravana on the mountains that are sitting pretty on the seashore, as well as in the forests on those mountains. Further, the delightful cities available alongshore like Muraci, Jaatapura, Avanti and Angalepa are to be searched together with the forest of Alakshita, including the nearby provinces and spacious townships. [4-42-12b, 13, 14]