  Searches for fast radio bursts (FRBs) are underway at a growing number of
radio telescopes worldwide. The sample size is now sufficient to enable many
investigations into the population properties. As such, understanding the true
sensitivity thresholds, effective observing time expended, survey completeness
and parameter space coverage has become vital for calibrating the observed
distributions. Recently the Molonglo FRB search team reported on their, as yet
unique, efforts to inject synthetic FRB signals into their telescope data
streams. Their results show 10 percent of injections being missed, even at very
high signal-to-noise (S/N) ratios. Their pipeline employs components considered
standard across several telescopes so that the result is potentially alarming.
In this paper we present a further look at these missed injections. It is shown
that all of the missed injections can be explained by combinations of the noise
statistics, mis-labelling, overly harsh data analysis cuts, incorrect S/N
calculations and radio frequency interference. There is no need to be alarmed.
