I'd suggest that you should be very careful claiming that the second hand contents of a home are worth over €19'000.
Unless you're looking at a house with some extremely expensive furnishings, I'm not sure that Revenue would believe that the contents are worth that high a figure (it's the cost of the contents you're buying, not the cost of replacing them with new items should you not purchase them).
Then again, depending on the property in question, it may be possible, just warning it may flag some attention with Revenue.
If I were going that route I'd detail the contents extremely well, note the quality/condition/age/etc, everything you can, to justify how the figure was calculated.