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A bulk acoustic wave cavity as high frequency gravitational wave antenna hasrecently detected two rare events at $5.5$MHz. Assuming that the detectedevents are due to gravitational waves, their characteristic strain amplitudelies at about $h_c\approx 2.5 \times 10^{-16}$. While a cosmological signal isout of the picture due to the large energy carried by the high frequency waves,the signal could be due to the merging of two planet mass primordial blackholes ($\approx 4\times 10^{-4} M_\odot$) inside the Oort cloud at roughly$0.025$ pc ($5300$ AU) away. In this short note, we show that the probabilityof one such event to occur within this volume per year is around $1:10^{24}$,if such Saturn-like mass primordial black holes are $1\%$ of the dark matter.Thus, the detected signal is very unlikely to be due the merger of planet massprimordial black holes. Nevertheless, the stochastic background of saturn massprimordial black holes binaries might be seen by next generation gravitationalwave detectors, such as DECIGO and BBO.

Were recently reported MHz events planet mass primordial black hole mergers?