It should be noted that these insertions have never been observed presently
Who is Your Creator: Endogenous Retroviruses
The question arises as to whether HERV elements can continue to change our genomic landscape through active retrotransposition or recombination events. While no direct evidence indicates that such events are ongoing in the human genome, members of the HERV-K family appear to be the most likely candidates for playing such a role.
Human Endogenous Retroviral Elements as Indicators of Ectopic Recombination Events in the Primate Genome
Although repeated sequence elements such as HERVs have the potential to lead to chromosomal rearrangement through homologous recombination between distant loci, evidence for the generality of this process is lacking.
Evidence for genomic rearrangements mediated by hu... [Nat Genet. 2001] - PubMed - NCBI.
PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVAbstractPlus
As for the elimination of the numerous copies produced by such rapid and extensive bursts, it is not yet clear whether recombination occurs continuously through time, thus slowly and regularly decreasing large amounts of DNA, or if there is any mechanism that would activate large recombination events following bursts of amplification, as proposed by some authors (Rabinowicz 2000).
Formation of Solo-LTRs Through Unequal Homologous Recombination Counterbalances Amplifications of LTR Retrotransposons in Rice Oryza sativa L.
No current transposition activity of HERVs or endogenization of human exogenous retroviruses has been documented so far.
Retroelements and the human genome: New perspectives on an old relation
Most of these elements represent ancient retroviral infections, as evidenced by their wide distribution in primate species, and no infectious counterparts of human endogenous retroviruses (HERVs) are known to exist today.
Human endogenous retrovirus K solo-LTR formation and insertional polymorphisms: Implications for human and viral evolution