No Robert they were dumped so the Eire government could not be accused of aiding the Republicans in the north, the reason being there had been a few rifles posted as "missing" and apparently recovered by either the British Army or the Royal Ulster Constabulary (PSNI).
This way there would be no come back, selling them off to the states during the late 1970's~80's would have been no good as there would have been every chance that some of them would have found their way home again via NORAID.
Part of my research into the Irish rifle situation has found that a lot of them (mainly SMLE No1 MkIII) were stored in damp conditions and the wood work had deteriorated quite badly, with a new NATO calibre just round the corner although Eire is a *neutral country it was not worth refurbishing them.
I must say every time I look at one of Krinko's post regarding No 4's that he has aquired that the UK government have sold off here I do feel somewhat envious.
*Eire's neutrality is these days somewhat in doubt given the roll the Irish Defence Force has taken within the Balkans and other areas with a NATO resposibility.